Inelastic neutron and x-ray scattering as probes of the sign structure of the Fe-pnictide superconducting gap
Abstract
Neutron spin-flip scattering observations of a resonance in the superconducting state is often taken as evidence of an unconventional superconducting state in which the gap changes sign (k+Q)=-(k) for momentum transfers Q which play an important role in the pairing. Recently questions regarding this identification for the Fe-pnictide superconductors have been raised and it has been suggested that (k+Q)=(k). Here we propose that inelastic neutron or x-ray scattering measurements of the spectral weight of a phonon of momentum Q can distinguish between these two pairing scenarios.
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